<?php
namespace App\Library;

use App\Models\video\CommonServer;

class WxPay
{

    protected $appId;
    protected $mchId;
    protected $mchKey;

    function __construct($appId, $mchId, $mchKey)
    {
        $this->appId = $appId;
        $this->mchId = $mchId;
        $this->mchKey = $mchKey;
    }

    //微信小程序接口
    public function toPay($param, &$msg = '')
    {
        //统一下单接口
        $unifiedOrder = $this->unifiedOrder($param);
        if (empty($unifiedOrder['prepay_id'])) {
            $msg = isset($unifiedOrder['return_msg']) ? $unifiedOrder['return_msg'] : "错误";
            return false;
        }
        $parameters = array(
            'appId' => $this->appId, //小程序ID
            'timeStamp' => '' . time() . '', //时间戳
            'nonceStr' => $this->createNoncestr(), //随机串
            'package' => 'prepay_id=' . $unifiedOrder['prepay_id'], //数据包
            'signType' => 'MD5'//签名方式
        );
        //签名
        $parameters['paySign'] = $this->getSign($parameters);
        return $parameters;
    }

    //qq小程序接口
    public function toQQPay($param, $data, &$msg = '')
    {
        $res = file_get_contents("https://api.q.qq.com/api/getToken?grant_type=client_credential&appid={$data["qqAppId"]}&secret={$data["qqAppSecret"]}");
        $res = @json_decode($res, true);
        if(empty($res["access_token"])){
            $msg = "获取QQ的token失败";
            return false;
        }
        $url = "https://api.q.qq.com/wxpay/unifiedorder?appid={$data["qqAppId"]}&access_token={$res["access_token"]}&&real_notify_url=".urlencode($param["notifyUrl"]);
        $parameters = array(
            'appid' => $this->appId, //小程序ID
            'mch_id' => $this->mchId, //商户号
            'nonce_str' => $this->createNoncestr(), //随机字符串
            'body' => $param['body'],
            'out_trade_no' => $param['out_trade_no'],
            'total_fee' => $param['total_fee'],
            'spbill_create_ip' => $_SERVER['REMOTE_ADDR'], //终端IP
            'notify_url' => "https://api.q.qq.com/wxpay/notify", //通知地址  确保外网能正常访问
            'trade_type' => "MWEB", //交易类型
        );
        if(!empty($param["attachData"])){
            $parameters["attach"] = $param["attachData"];
        }
        //统一下单签名
        $parameters['sign'] = $this->getSign($parameters);
        $result = $this->postXmlCurl($this->arrayToXml($parameters), $url, 60);
        if(empty($result)){
            return '';
        }
        $return = $this->xmlToArray($result);
        if(isset($return["return_code"]) && $return["return_code"] == "FAIL") {
            $msg = isset($return["return_msg"]) ? $return["return_msg"] : "错误";UpTools::writeLog(var_export($return, true).$msg);
            return false;

        }
        $return["referer"] = pathinfo(CommonServer::getUrl(), PATHINFO_BASENAME);
        return $return;
    }

    //统一下单接口
    private function unifiedOrder($data)
    {
        $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
        $parameters = array(
            'appid' => $this->appId, //小程序ID
            'mch_id' => $this->mchId, //商户号
            'nonce_str' => $this->createNoncestr(), //随机字符串
            'body' => $data['body'],
            'out_trade_no' => $data['out_trade_no'],
            'total_fee' => $data['total_fee'],
            'spbill_create_ip' => $_SERVER['REMOTE_ADDR'], //终端IP
            'notify_url' => $data["notifyUrl"], //通知地址  确保外网能正常访问
            'openid' => $data['openid'], //用户id
            'trade_type' => "JSAPI", //交易类型
        );
        if(!empty($data["attachData"])){
            $parameters["attach"] = $data["attachData"];
        }
        //统一下单签名
        $parameters['sign'] = $this->getSign($parameters);
        $result = $this->postXmlCurl($this->arrayToXml($parameters), $url, 60);
        if(empty($result)){
            return '';
        }
        $return = $this->xmlToArray($result);
        return $return;
    }

    /**
     * @param $xml
     * @param $url
     * @param int $second
     * @param array $header
     * @return mixed|string
     */
    private function postXmlCurl($xml, $url, $second = 30, $header = null)
    {
        $ch = curl_init();
        //设置超时
        curl_setopt($ch, CURLOPT_TIMEOUT, $second);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //严格校验
        //设置header
        if($header) {
            curl_setopt($ch, CURLOPT_HEADER, $header);
        }
        //要求结果为字符串且输出到屏幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        //post提交方式
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);

        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
        curl_setopt($ch, CURLOPT_TIMEOUT, 40);
        set_time_limit(0);

        //运行curl
        $data = curl_exec($ch);
        //返回结果
        if ($data) {
            curl_close($ch);
            return $data;
        } else {
            return "";
        }
    }

    //数组转换成xml
    private function arrayToXml($arr)
    {
        $xml = "<xml>";
        foreach ($arr as $key => $val) {
            if (is_array($val)) {
                $xml .= "<" . $key . ">" . $this->arrayToXml($val) . "</" . $key . ">";
            } else {
                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
            }
        }
        $xml .= "</xml>";
        return $xml;
    }

    //xml转换成数组
    private function xmlToArray($xml)
    {
        //禁止引用外部xml实体
        libxml_disable_entity_loader(true);
        $xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);
        $val = json_decode(json_encode($xmlstring), true);
        return $val;
    }

    //作用：产生随机字符串，不长于32位
    private function createNoncestr($length = 32)
    {
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
        $str = "";
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }
        return $str;
    }

    //作用：生成签名
    private function getSign($Obj)
    {
        foreach ($Obj as $k => $v) {
            $Parameters[$k] = $v;
        }
        //签名步骤一：按字典序排序参数
        ksort($Parameters);
        $String = $this->formatBizQueryParaMap($Parameters, false);
        //签名步骤二：在string后加入KEY
        $String = $String . "&key=" . $this->mchKey;
        //签名步骤三：MD5加密
        $String = md5($String);
        //签名步骤四：所有字符转为大写
        $result_ = strtoupper($String);
        return $result_;
    }

    ///作用：格式化参数，签名过程需要使用
    private function formatBizQueryParaMap($paraMap, $urlencode)
    {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if ($urlencode) {
                $v = urlencode($v);
            }
            $buff .= $k . "=" . $v . "&";
        }
        $reqPar = '';
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }
        return $reqPar;
    }
}